Noun:
ধর্মান্ধ, অন্ধবিশ্বাসী.
Adjective:
ধর্মান্ধ, ফ্যানাটিক, গোঁড়া, সংকীর্ণ, আচারনিষ্ঠ.
As a mindless FANATIC.
I never really believed you were a FANATIC.
I suppose it's hard for a FANATIC to admit a mistake.
Isn't that the whole point of being a FANATIC?
The king cannot sully himself negotiating with an unwashed FANATIC.